Early Carboniferous Gastropoda from the Tamworth Belt, New South Wales, Australia
Author
Yoo, E. K.
text
Records of the Australian Museum
1994
1994-05-19
46
1
63
120
https://journals.australian.museum/yoo-1994-rec-aust-mus-461-63120/
journal article
10.3853/j.0067-1975.46.1994.18
b5d2a24f-697a-4fc3-9612-978fb532e815
0067-1975
4654599
'Serpulospira' scalariformis
n.sp.
PI. 2 figs 8-10, PI. 3 figs 1-5
Description. Shell minute, openly coiled. Protoconch bulbous, smooth, curved; margin with teleoconch sharp and distinct. Teleoconch openly coiled, in early whorls with asymmetric spire tending to be symmetric with contact between spires in later whorls; nearly smooth but growth lines distinct throughout, aperture rounded.
| Dimensions. |
MD
|
DA
|
|
Holotype
|
(
F78360
)
|
2.3mm
|
0.8mm
|
|
Paratypes
(
F78357
)
|
2.8 |
1.0 |
|
(
F78359
)
|
2.1 |
0.6 |
|
(
F78361
)
|
2.9 |
TODO |
|
(
F78362
)
|
1.3 |
0.3 |
|
(
F78358
a)
|
1.4 |
0.4 |
|
(
F78358
b)
|
1.3 |
0.4 |
| Dimensions. H |
W |
PA |
NW |
|
Holotype
(
F78363
)
2.2 mm
Paratypes
(
F78364
a)1.9 (
F78364
b)2.3
|
1.2 mm
TODO 1.4
|
1500 TODO 145 |
TODO 31/1 5 |
Types.
Holotype
(
F78360
) and 6 figured
paratypes
(
F78357
-9,
F78361
-2). There are 48 unfigured
additional specimens
(
F78390
) from the type locality.
Type
locality.
150 m
west of 'Marohn' homestead, on the Scone-Gundy roadside,
4 km
south-west of Gundy, NSW (Locality 28).
Stratigraphic position. In bioclastic limestone, upper part of the Dangarfield Formation.
Additional material.
10 specimens
from Oxley Highway (Locality 22-2), 3 from south-east of 'Rangari' (Locality 18) and 2 from Glenbawn (Locality 30).
Geographic distribution. 'Rangari' to Glenbawn.
Geological age. Middle to late Tournaisian.
Etymology. Referring to disjunct whorls.
Remarks. The bulbous and smooth protoconch of
'Serpulospira'
scalariformis
n.sp.
is similar to that of hyoliths. The difference is that the protoconch of this species is curved. The nature of spire and growth lines on the teleoconch suggest that the species could be referred to the macluritoidean gastropods proposed by Linsley (l978a). The species is tentatively placed in the Euomphaloidea, but that is considered problematic by Bandel (personal communication).